== P3.16	Flux calibration (off-centered target observation) == 
•	**Phase**		:	3  
•	**Status**		: 	Draft	 
•	**Category**		: 	Nighttime Science Calibration (C5)
•	**Recurrence**	: 	once at commissioning and then on request for deep coronagraphic observations.
•	**Duration**		: 	1 hour
**Description**
•	Flux calibration to allow contrast estimation between the central star and a close companion, by measuring the star flux out of the coronagraph 
**Prerequisites**
•	Authorize SHARK-NIR on the SX side.
•	Atmospheric conditions: AO working conditions.
•	Bad pixel map, Background or Dark, Flat-field, distortion map 
**Procedure**
•	On target, the same set-up as an observation on science target; AO closed-loop, ND for bright targets to prevent detector saturation, the star behind coronagraph centered and off-centered keeping the stop. The derotator mode should be tracking the field with possible adjustment of the angle to prevent the star from rotating around the coronagraph. 
•	Observe a star with the coronagraphic devices after an offset of 0.5” is applied. 
**Success criteria**
•	Flux of the star measured within the accuracy of 0.1 mag 
**Notes**
•	Same as activity 7.2 in AD4
**LBTO support**
•	SOUL-AO support
**Associated SHARK-NIR personnel**

**Date performed and by whom**